 /*******************************************************************************
  * Copyright (c) 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  ******************************************************************************/

 package org.eclipse.ui.services;

 /**
  * <p>
  * A component with which one or more services are registered. The services can
  * be retrieved from this locator using some key -- typically the class
  * representing the interface the service must implement. For example:
  * </p>
  *
  * <pre>
  * IHandlerService service = (IHandlerService) workbenchWindow
  * .getService(IHandlerService.class);
  * </pre>
  *
  * <p>
  * This interface is not to be implemented or extended by clients.
  * </p>
  *
  * @since 3.2
  */
 public interface IServiceLocator {

     /**
      * Retrieves the service corresponding to the given API.
      *
      * @param api
      * This is the interface that the service implements. Must not be
      * <code>null</code>.
      * @return The service, or <code>null</code> if no such service could be
      * found.
      */
     public Object getService(Class api);

     /**
      * Whether this service exists within the scope of this service locator.
      * This does not include looking for the service within the scope of the
      * parents. This method can be used to determine whether a particular
      * service supports nesting in this scope.
      *
      * @param api
      * This is the interface that the service implements. Must not be
      * <code>null</code>.
      * @return <code>true</code> iff the service locator can find a service
      * for the given API; <code>false</code> otherwise.
      */
     public boolean hasService(Class api);
 }

